• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    indexable cutting insert, and, cutting tool on a cutting tool having an indexable cutting insert (20) with three cutting portions (26), the cutting insert is removably fixable to an insert retainer (52) by of a fastener (54). the cutting insert has two opposite end surfaces (22) with a peripheral side surface (24) extending between them. at least one end surface has a central relief (36) projecting from it with a raised support surface (38) and the peripheral side surface has three supporting recesses (28). in an end view of the cutting insert, each of the three supporting recesses is visible and located within a first imaginary circle (c1) circumscribing the visible central relief. a retaining portion of the insert retainer has a seating surface (58) with at least one protrusion (60a, 60b) projecting from it. the support surface is in contact with the seating surface and exactly two of the three support recesses are engaged with at least one protuberance.
    公开号:BR112015015157B1
    申请号:R112015015157-4
    申请日:2013-12-04
    公开日:2020-08-11
    发明作者:Gil Hecht
    申请人:Iscar Ltd；
    IPC主号:
    专利说明:

    Field Of Invention
    [001] The present invention relates to metal cutting tools for use in groove turning and grooving operations having an indexable cutting insert with a plurality of cutting portions. Fundamentals Of Invention
    [002] Within the field of metal cutting tools used in grooving and grooving operations, cutting inserts removably fixable on an insert retainer have long been providing a means of performing a cutting operation with a material suitably hard, ie cemented carbide, in the vicinity of the cutting edge, where the insert retainer, made from a less hard material, is reusable after the disposal of a worn or damaged cutting insert.
    [003] This type of cutting tool was further developed to use indexable cutting inserts with an increased number of cutting edges, providing economic benefits from the provision of an increased number of cutting operations per cutting insert. This type of cutting tool was also developed to provide a more efficient way of attaching the indexable insert to the insert retainer.
    [004] US patent 4,461,602 describes a cutter consisting of a tree, a cutter plate and a threaded pin whereby the cutter plate is detachably attached to the front end of the tree. The latter has a recess on its front face. The recess is defined by three flat side faces leaving a peripheral interstice between each pair. The substantially triangularly formed cutting plate is fitted to the recess to be immobile in a radial plane. Projections of the cutter plate protrude through the interstices and are provided with a cutting edge respectively.
    [005] US patent 5,607,263 describes a cutting plate having a disk-shaped body with three teeth and a single projection formed jointly. The retainer has a recess in the front face that is completely enclosed by a retainer wall. As shown in Figs. 5 and 6 of US 5,607,263, the projection has a coupling surface contoured by a convex triangular polygon and the recess has a counter surface with the contour of a concave triangular polygon and in a charged state, three contact zones are formed between the mating surface and the counter surface.
    [006] It is an object of the present invention to provide an improved indexable cutting insert and a cutting tool.
    [007] It is also an object of the present invention to allow the cutting insert to be stably attached to a body combined with an efficient use of space.
    [008] It is also an object of the present invention to provide a cutting insert suitable for cutting tools both on the left and on the right.
    [009] It is a further object of the present invention to provide a cutting tool with good support for the operative cutting portion.
    [0010] It is yet another object of the present invention to provide a cutting tool that can perform internal groove turning operations at depths of cut equal to or greater than a quarter of the hole diameter of the workpiece without the retaining portion extend. Summary of the Invention
    [0011] According to the present invention, an indexable cutting insert is provided comprising two opposite end surfaces with a peripheral side surface and a central geometric axis extending between them, a median plane located between the two end surfaces opposite, exactly three cutting portions, each cutting portion having a main cutting edge extending from one end surface to the other end surface, exactly three supporting recesses on the peripheral side surface, and a central relief projecting from at least one of the two opposite end surfaces, where each central relief has a raised support surface located axially further from the median plane than any point on the three main cutting edges located on the same side of the median plane, and in which, in an end view of the cutting insert, each of the three supporting recesses is seen sible and located inside a first imaginary circle circumscribing the central relief.
    [0012] Also according to the present invention, a cutting tool is provided comprising an insert retainer and at least one cutting insert of the type described above retained therein.
    [0013] The insert retainer has a retaining portion extending along a longitudinal axis of the tool, the retaining portion having a seating surface transverse to the longitudinal axis of the tool, with at least one protrusion protruding from the seat surface, the at least one cutting insert being removably fixable to the insert retainer by means of a fastener, where exactly one cutting portion of each cutting insert is operative, in which a supporting surface of each The cutting insert is in contact with the seating surface, and exactly two of the three supporting recesses of each cutting insert are engaged with at least one protuberance. Brief Description of Drawings
    [0014] For a better understanding, the invention will now be described, by way of example only, with reference to the attached drawings in which the dashed lines in chain represent cut-off borders for partial views of a limb and in which: Fig. 1 it is a perspective view of a cutting insert according to some embodiments of the present invention; Fig. 2 is an end view of the cutting insert shown in Fig. 1; Fig. 3 is a cross-sectional view of the cutting insert shown in Fig. 2, taken along line III-III; Fig. 4 is a cross-sectional view of the cutting insert shown in Fig-3, taken along line IV-IV; Fig. 5 is a detailed view of the cutting insert shown in Fig. 3; Fig. 6 is an exploded perspective view of a cutting tool according to some embodiments of the present invention; Fig. 7 is an end view of the cutting tool shown in Fig-6, with the fastener removed; Fig. 8 is a perspective view of an insert retainer according to some embodiments of the present invention; and, Fig. 9 is an end view of the insert retainer shown in Fig-8. Detailed Description of the Invention
    [0015] Attention is first directed to Figs. 1 to 5, showing an indexable cutting insert 20 that can be manufactured by pressing, forming and sintering a cemented carbide, such as tungsten carbide and can be coated or uncoated.
    [0016] According to the present invention, the cutting insert 20 has two opposite end surfaces 22 with a peripheral side surface 24 and a central geometric axis A1 extending between them and exactly three cutting portions 26.
    [0017] In some embodiments of the present invention, the cutting insert 20 can be indexable around the central geometric axis Al.
    [0018] According to the present invention, the peripheral side surface 24 has exactly three supporting recesses 28 and each of the three cutting portions 26 has a main cutting edge 30 extending from an end surface 22 to the other end surface 22.
    [0019] In some embodiments of the present invention, as shown in Figs. 1 and 4, each of the three main cutting edges 30 can be formed by the intersection of an inclined surface 32 and a gap surface 34 and the inclined and gap surfaces 32, 34 can be located on the peripheral side surface 24.
    [0020] Also, in some embodiments of the present invention, the three cutting portions 26 can be equally spaced circumferentially around the central geometric axis Al alternating with the three supporting recesses 28.
    [0021] In addition, in some embodiments of the present invention, the three cutting portions 26 can be circumferentially and radially spaced from the three supporting recesses 28.
    [0022] Furthermore, in some embodiments of the present invention, all three cutting portions 26 can be identical.
    [0023] Furthermore, in some embodiments of the present invention, all three support recesses 28 can be identical.
    [0024] It should be appreciated that use of the terms "radially" and "axially" throughout the description and claims refers to the positioning of elements of the cutting insert 20 with respect to the central geometric axis Al.
    [0025] As shown in Fig. 2, the cutting insert 20 may show symmetry in rotation around the central geometric axis Al.
    [0026] In some embodiments of the present invention, as shown in Fig. 2, each of the three cutting portions 26 may have a radial plane PI containing the central geometric axis Al and a first point NI on its respective cutting edge principal 30.
    [0027] Also, in some embodiments of the present invention, as shown in Fig. 2, each radial plane PI can form an acute internal clearance angle oc with an imaginary straight clearance line Ec tangential to the immediately adjacent clearance surface 34 its respective first NI point and the acute clearance angle CL can be 75 degrees or more, ie c> 75 °.
    [0028] Configuring the cutting insert 20 to have clearance angles oc equal to or greater than 75 degrees advantageously provides robust support for the operating cutting edge 30 during internal groove turning operations.
    [0029] It should be appreciated that the use of the terms "internal angle" and "external angle" throughout the description and claims refers to an angle between two flat and / or linear components as measured internal and external to the member on which these components are formed, respectively.
    [0030] According to the present invention, as shown in Figs. 3 and 5, the cutting insert 20 has a median plane M located between the two opposite end surfaces 22 and a central relief 36 projecting from at least one of the two opposite end surfaces 22. Each central relief 36 has an elevated support surface 38 located axially further from the median plane M than any point on the three main cutting edges 30 located on the same side of the median plane M.
    [0031] Configuring the cutting insert 20 with raised support surfaces 38 advantageously allows modification of the three cutting portions 26 to obtain multiple product variants without changing the support surfaces 38.
    [0032] In some embodiments of the present invention, each of the three cutting portions 26 can be radially spaced from at least one central relief 36.
    [0033] Also, in some embodiments of the present invention, as shown in Fig. 2, each central relief 36 can have three second points N2 contained in the three radial planes PI and each second point N2 can be located at the shortest distance between their respective central relief 36 and their respective first point Nl.
    [0034] In addition, in some embodiments of the present invention, as shown in Fig. 2, each second point N2 can be located on a curved portion 76 of its respective central relief 36 and each curved portion 76 can be convex outward in relation to the central geometric axis Al.
    [0035] Configuring each curved portion 76 to be convex outwards in relation to the central geometric axis Al advantageously allows the cutting depths of internal grooving operations to be optimized.
    [0036] Furthermore, in some embodiments of the present invention, each of the three cutting portions 26 may have two small cutting edges 40, each small cutting edge 40 extending out of its associated main cutting edge 30 in a direction to the median plane M.
    [0037] As shown in Figs. 3 and 5, both end surfaces 22 may have a central relief 36, such that the cutting insert 20 has a total of two central reliefs 36.
    [0038] In some embodiments of the present invention, as shown in Fig. 3, each support surface 38 can be substantially flat and perpendicular to the central geometric axis A1.
    [0039] Configuring each support surface 38 to be flat and perpendicular to the central geometric axis Al advantageously facilitates precise and repeatable alignment of the cutting insert 20.
    [0040] Also, in some embodiments of the present invention, as shown in Figs. 3 and 5, each support surface 38 can be axially the outermost surface of its associated end surface 22.
    [0041] As shown in Fig. 3, the median plane M can be perpendicular to the central geometric axis Al. In some embodiments of the present invention, the median plane M can intercept the peripheral lateral surface 24 along the entire perimeter peripheral lateral surface 24.
    [0042] Also, in some embodiments of the present invention, as shown in Fig. 3, the cutting insert 20 may have specular symmetry around the median plane M. In such embodiments, the cutting insert 20 is reversible and it can advantageously be suitable for cutting tools on both the left and right.
    [0043] According to the present invention, in an end view of the cutting insert 20, as shown in Fig. 2, each of the three supporting recesses 28 is visible and at least partially located within a first imaginary circle Cl circumscribing the visible central relief 36. The first imaginary circle Cl has a first diameter D1.
    [0044] Configuring the cutting insert 20 with the three supporting recesses 28 inside the first imaginary circle Cl advantageously allows the cutting insert 20 to be stably attached to a conjugated body with an efficient use of space.
    [0045] In some embodiments of the present invention, each of the three support recesses 28 may be visible in both end views of the cutting insert 20.
    [0046] Also, in some embodiments of the present invention, each of the three support recesses 28 can intercept each central relief 36.
    [0047] In alternative embodiments of the present invention (not shown), each central relief may comprise three spaced projections having coplanar support surfaces.
    [0048] As shown in Fig. 2, the three main cutting edges 30 can define a second imaginary circle C2 having a second diameter D2 that circumscribes the peripheral lateral surface 24.
    [0049] In some embodiments of the present invention, the center of the second imaginary circle C2 can be coincident with the central geometric axis Al.
    Also, in some embodiments of the present invention, the first diameter D1 can be equal to or less than two thirds of the second diameter D2, i.e., Dl <2 / 3D2.
    [0051] In addition, in some embodiments of the present invention, each curved portion 76 may have a radius equal to or less than the radius of the second imaginary circle C2.
    [0052] Setting the radius of each curved portion 76 to be equal to or less than the radius of the second imaginary circle C2 advantageously allows the cutting depths of internal grooving operations in small diameter holes to be optimized.
    [0053] In an end view of the cutting insert 20, as shown in Fig. 2, a third imaginary circle C3 can contain the visible central relief 36 and exactly two of the three cutting portions 26.
    [0054] In some embodiments of the present invention, the second and third imaginary circles C2, C3 can have the same second diameter D2 and an offset distance O between the centers of the second and third imaginary circles C2, C3 can be equal to or greater than a quarter of its second diameter D2, ie, O> D2 / 4.
    [0055] In an end view of the cutting insert 20, as shown in Figs. 2 and 4, each of the three support recesses 28 can have a pair of spaced support surfaces 44a, 44b forming a V-shape.
    [0056] In some embodiments of the present invention, each pair of bearing surfaces 44a, 44b can be spaced by a curved joining surface 46 and each joining surface 46 may contain the radially innermost point of its bearing recess associated 28.
    [0057] Also, in some embodiments of the present invention, each support surface 44a, 44b can contain an imaginary straight support line LA parallel to the central geometric axis Al.
    [0058] Furthermore, in some embodiments of the present invention, each support surface 44a, 44b can be substantially flat and in a cross section of the cutting insert 20 taken in a plane perpendicular to the central geometric axis Al, as shown in Fig. 4, each pair of support surfaces 44a, 44b can make an external recess angle β having a value between 60 and 120 degrees, ie 60 ° <β <120 °.
    [0059] Furthermore, in some embodiments of the present invention, the recess angle β between each pair of support surfaces 44a, 44b can be between 60 and 120 degrees in any cross section of the cutting insert 20 taken in a plane perpendicular to the central geometric axis Al.
    [0060] In some embodiments of the present invention, each end surface 22 may include a bottom surface 48 extending radially inward from each of the three cutting portions 26.
    [0061] As shown in Fig. 5, each lower surface 48 can be axially closer to the median plane M than a portion of the main cutting edge 30 of its associated cutting portion 26.
    [0062] Also, as shown in Fig. 5, each bottom surface 48 can be substantially flat and perpendicular to the central geometric axis A1 and each bottom surface 48 can define a bottom plane P2 that intersects the main cutting edge 30 of its portion of associated cut 26.
    [0063] Attention is now directed to Figs. 6 and 7 showing a cutting tool 50 according to the present invention, comprising an insert retainer 52 and at least one cutting insert 20.
    [0064] The at least one cutting insert 20 is removably attached to the insert retainer 52 by means of a fastener 54.
    [0065] As shown in Figs. 8 and 9, the insert retainer 52 has a retaining portion 56 extending along a longitudinal axis of tool A2 and the retaining portion 56 has a seating surface 58 transverse to the longitudinal axis of tool A2, with at least one protrusion 60a, 60b protruding from the seat surface 58.
    [0066] In some embodiments of the present invention, the seating surface 58 can be substantially flat and perpendicular to the longitudinal geometric axis of tool A2.
    [0067] According to the present invention, as shown in Fig. 7, exactly a cutting portion 26 of each cutting insert 20 is operative, a support surface 38 of each cutting insert 20 is in contact with the seat surface 58 and exactly two of the three bearing recesses 28 of each cutting insert 20 are engaged with at least one protrusion 60a, 60b.
    [0068] In some embodiments of the present invention, as shown in Fig. 7, exactly two spaced corner portions 42a, 42b of at least one protrusion 60a, 60b can be located within the first imaginary circle Cl of each insert of cut 20.
    [0069] Also, in some embodiments of the present invention, as shown in Figs. 2 and 7, each cutting insert 20 may comprise a central hole 62 extending coaxially with its central geometric axis A1.
    [0070] In addition, in some embodiments of the present invention, the central hole 62 can be visible in both end views of the cutting insert 20.
    [0071] Furthermore, in some embodiments of the present invention, as shown in Fig. 6, the fastener 54 can be in the form of a holding screw 64 extending through the central hole 62 of the cutting insert and engaging a threaded hole 66 in the seat surface 58 of the retaining portion 56.
    [0072] As shown in Fig. 7, the inclined surfaces 32 of each cutting insert 20 can generally face in a first circumferential direction dl around the central geometric axis Al and the exactly two supporting recesses 28 of each cutting insert. 20 engaging with at least one protrusion 60a, 60b may be the first and second bearing recesses 28a, 28b closest to their operative cutting portion 26a in a second opposite circumferential direction d2 about their central geometric axis Al. While that is, the nearest supporting recess 28c in the first circumferential direction dl around the central geometric axis Al remains disengaged.
    [0073] Configuring the cutting tool 50 such that the first support recess closest to its operative cutting portion 26a in the second circumferential direction d2 engages with at least one protrusion 60a, 60b can advantageously support the portion of operative cut 26a and absorb operational cut forces.
    [0074] In some embodiments of the present invention, both support surfaces 44a, 44b associated with the first support recess the closest 28a to its operative cutting portion 26a in the second circumferential direction d2 may be in contact with the at least one protrusion 60a, 60b and only one of the support surfaces 44a associated with the second support recess the closest 28b to its operative cutting portion 26a in the second circumferential direction d2 may be in contact with the at least one bulge 60a, 60b.
    [0075] Also, in some embodiments of the present invention, the two support surfaces 44a, 44b associated with the first support recess the closest 28a to its operative cutting portion 26a in the second circumferential direction d2 may be in contact with clamping with corresponding first and second reaction walls 68, 70 of at least one protrusion 60a, 60b and the single supporting surface 44a associated with the second supporting recess the closest 28b to its operative cutting portion 26a in the second circumferential direction d2 may be in contact with a corresponding third reaction wall 72 of at least one protrusion 60a, 60b and each of the first, second and third reaction walls 68, 70, 72 may contain an imaginary straight reaction line LR parallel to the longitudinal geometric axis of tool A2.
    [0076] As shown in Fig. 7, the only support surface 44a in contact with the third reaction wall 72 can generally face the second circumferential direction d2 around its central geometric axis Al.
    [0077] In some embodiments of the present invention, each threaded hole 66 may be eccentric with respect to its respective central hole 62. In such embodiments, tightening the clamping screw 64 within its threaded hole 66 requires each insert section 20 in a transverse direction with respect to the longitudinal geometric axis of tool A2, thus ensuring contact between three of its supporting surfaces 44a, 44b and three corresponding reaction walls 68, 70, 72.
    [0078] Also, in some embodiments of the present invention, as shown in Figs. 6 and 7, exactly a cutting insert 20 can be attached to the insert retainer 52, exactly two spaced protrusions 60a, 60b can project from the seat surface 58 and the first and second reaction walls 68, 70 can be located on a first protrusion 60a and the third reaction wall 72 can be located on a second protrusion 60b. In such embodiments, the first protrusion 60a has a first corner portion 42a and the second protrusion 60b has a second corner portion 42b.
    [0079] Configuring the insert retainer 52 with exactly two spaced protrusions 60a, 60b advantageously allows the single cutting insert 20 to be attached to the insert retainer 52 with an efficient use of space.
    [0080] In some embodiments of the present invention, having exactly a cutting insert 20 attached to the insert retainer 52, the retaining portion 56 can be elongated and extend longitudinally out of a stem portion 74.
    [0081] In an end view of the cutting tool 50, as shown in Fig. 7, the second imaginary circle C2 can contain the entire retaining portion 56.
    [0082] Also, in an end view of the cutting tool 50, as shown in Fig. 7, the third imaginary circle C3 can contain the entire retaining portion 56.
    [0083] As the deviation distance O between the centers of the second and third imaginary circles C2, C3 can be equal to or greater than a quarter of its second diameter D2, ie, O> D2 / 4, the cutting tool 50 can advantageously be used to perform internal groove turning operations at depths of cut equal to or greater than a quarter of the bore diameter of the workpiece within which the retaining portion 56 extends.
    [0084] In alternative embodiments of the present invention (not shown), the cutting tool can have a plurality of cutting inserts removably attached to the seat surface of the insert retainer and the cutting tool can be rotatable about the axis longitudinal geometry of the tool and used in groove milling operations.
    [0085] Although the present invention has been described to a certain degree of particularity, it should be understood that various changes and modifications can be made without departing from the spirit or scope of the invention as claimed below.
    权利要求:
    Claims (13)
    [0001]
    1. Indexable cutting insert (20), comprising: two opposite end surfaces (22) with a peripheral lateral surface (24) and a central geometric axis (Al) extending between them, a median plane (M) located between the two opposite end surfaces (22), exactly three cutting portions (26), each cutting portion (26) having a main cutting edge (30) extending from an end surface (22) to the other end surface (22), exactly three supporting recesses (28) on the peripheral side surface (24), and a central relief (36) projecting from at least one of the two opposite end surfaces (22) , in which each central relief (36) has a raised support surface (38) located axially further from the median plane (M) than any point on the three main cutting edges (30) located on the same side of the median plane (M), and in an end view of the i cutting insert (20) each of the three support recesses (28) is visible and located inside a first imaginary circle (Cl) circumscribing the central relief (36); where each of the three main cutting edges (30) is formed by the intersection of an inclined surface (32) and a gap surface (34), and where the inclined and gap surfaces (32, 34) are located on the peripheral lateral surface (24); wherein each of the three cutting portions (26) has a radial plane (Pl) containing the central geometric axis (Al) and a first point (Nl) on its respective main cutting edge (30); and in which each radial plane (Pl) forms an acute internal clearance angle (oc) with an imaginary straight clearance line (Lc) tangential to the clearance surface (34) immediately adjacent to its respective first point (Nl); characterized by the fact that the acute clearance angle (oc) has a value equal to or greater than 75 degrees.
    [0002]
    2. Cutting insert (20) according to claim 1, characterized by the fact that in both end views of the cutting insert (20), each of the three supporting recesses (28) is visible.
    [0003]
    3. Cutting insert (20) according to claim 1, characterized by the fact that: the three main cutting edges (30) define a second imaginary circle (C2) having a second diameter (D2) that circumscribes the peripheral lateral surface (24); the first imaginary circle (Cl) has a first diameter (Dl); and, the first diameter (Dl) is equal to or less than two thirds of the second diameter (D2).
    [0004]
    4. Cutting insert (20) according to claim 1, characterized by the fact that each central relief (36) has three second points (N2) contained in the three radial planes (Pl) and each second point (N2) is located at the shortest distance between its respective central relief (36) and its respective first point (Nl).
    [0005]
    5. Cutting insert (20) according to claim 4, characterized by the fact that: each second point (N2) is located on a curved portion (76) of its respective central relief (36); and, each curved portion (76) is convex outwardly in relation to the central geometric axis (Al).
    [0006]
    Cutting insert (20) according to claim 1, characterized in that in an end view of the cutting insert (20) at least a portion of the sloping surface (32) of each cutting portion (26) is located on the same side of its respective radial plane (Pl) as the adjacent clearance surface (34).
    [0007]
    7. Cutting tool (50), comprising an insert retainer (52) and at least one indexable cutting insert (20) retained therein; wherein the at least one indexable cutting insert (20) comprises: two opposite end surfaces (22) with a peripheral side surface (24) and a central geometric axis (Al) extending between them, a median plane ( M) located between the two opposite end surfaces (22), exactly three cutting portions (26), each cutting portion (26) having a main cutting edge (30) extending from an end surface ( 22) for the other end surface (22), exactly three supporting recesses (28) on the peripheral side surface (24), and a central relief (36) projecting from at least one of the two opposite end surfaces (22), where each central relief (36) has an elevated support surface (38) located axially further from the median plane (M) than any point on the three main cutting edges (30) located on the same side of the median plane (M), and in a view from end of the cutting insert (20) each of the three support recesses (28) is visible and located inside a first imaginary circle (Cl) circumscribing the central relief (36); o at least one cutting insert (20) being removably fixable to the insert retainer (52) by means of a fastener (54); wherein exactly one cutting portion (26) of each cutting insert (20) is operative, characterized by the fact that: the insert retainer (52) has a retaining portion (56) extending along a geometric axis longitudinal part of the tool (A2), the retaining portion (56) having a seating surface (58) transversal to the longitudinal axis of the tool (A2), with at least one protuberance (60a, 60b) projecting from the surface seat (58), wherein a support surface (38) of each cutting insert (20) is in contact with the seat surface (58); and, exactly two of the three support recesses (28) of each cutting insert (20) are engaged with at least one protuberance (60a, 60b).
    [0008]
    8. Cutting tool (50) according to claim 7, characterized in that exactly two spaced corner portions (42a, 42b) of at least one protuberance (60a, 60b) are located inside the first imaginary circle ( Cl) of each cutting insert (20).
    [0009]
    9. Cutting tool (50) according to claim 7, characterized by the fact that: each of the three cutting portions (26) of each cutting insert (20) has an inclined surface (32) generally turned in a first circumferential direction (dl) around the central geometric axis (Al); and, the exactly two supporting recesses (28) of each cutting insert (20) engaging with at least one protuberance (60a, 60b) are the first and second supporting recesses the closest (28a, 28b) to the portion of operative cut (26a) of the cutting inserts in a second opposite circumferential direction (d2) around its central geometric axis (Al).
    [0010]
    10. Cutting tool (50) according to claim 9, characterized in that: each of the three support recesses (28) of each cutting insert (20) has a pair of spaced support surfaces (44a, 44b) forming a V-shape in an end view of each cutting insert (20); both support surfaces (44a, 44b) associated with the first support recess the closest (28a) to its operative cutting portion (26a) in the second circumferential direction (d2) are in contact with the at least one protuberance (60a, 60b); and, only one of the support surfaces (44a) associated with the second support recess the closest (28b) to its operative cutting portion (26a) in the second circumferential direction (d2) is in contact with the at least one protuberance (60a, 60b).
    [0011]
    Cutting tool (50) according to claim 10, characterized in that: the two support surfaces (44a, 44b) associated with the first support recess the closest (28a) to its operative cutting portion (26a) in the second circumferential direction (d2) are in contact with corresponding first and second reaction walls (68, 70) of at least one protuberance (60a, 60b), in which the only supporting surface (44a) is associated with the second support recess the closest (28b) to its operative cutting portion (26a) in the second circumferential direction (d2) is in contact with a corresponding third reaction wall (72) of at least one protuberance (60a , 60b); and each of the first, second and third reaction walls (68, 70, 72) contains a straight imaginary reaction line (LR) parallel to the longitudinal geometric axis of the tool (A2).
    [0012]
    Cutting tool (50) according to claim 7, characterized in that: exactly one cutting insert (20) is attached to the insert retainer (52); and, the three main cutting edges (30) define a second imaginary circle (C2) having a second diameter (D2) that circumscribes its peripheral lateral surface (24).
    [0013]
    Cutting tool (50) according to claim 12, characterized in that: the retaining portion (56) is elongated and extends longitudinally away from a shank portion (74); and, in an end view of the cutting tool (50), the second imaginary circle (C2) contains the entire retaining portion (56).
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    US10005132B2|2018-06-26|
    CA2891299C|2018-07-24|
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    法律状态:
    2018-11-21| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-11-26| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-07-21| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-08-11| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 04/12/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/733,717|US9216463B2|2013-01-03|2013-01-03|Cutting tool and cutting insert having exactly three cutting portions therefor|
    US13/733,717|2013-01-03|
    PCT/IL2013/050994|WO2014106836A1|2013-01-03|2013-12-04|Cutting tool and cutting insert having exactly three cutting portions therefor|
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